YAN Yu-ting1, NI Xue-feng2, JIANG Jian-wu1, et al. Theoretical Analysis and Experiment about Effect of Contamination Resistance on Accuracy of CVT[J]. High voltageapparatus, 2009, 45(2): 62-65+69.
YAN Yu-ting1, NI Xue-feng2, JIANG Jian-wu1, et al. Theoretical Analysis and Experiment about Effect of Contamination Resistance on Accuracy of CVT[J]. High voltageapparatus, 2009, 45(2): 62-65+69.DOI:
To improve measurement accuracy of capacitor voltage transformer
a formula to calculate the error due to the effect of contamination resistance on accuracy of CVT with different rated capacitances and different sections is presented.A series of simulations under different conditions are conducted via ATP software
and the results show that when the rated capacitance of a CVT is 0.01 μF and the contamination resistance on ceramic bushing surface is smaller than 5 MΩ
the measurement accuracy of CVT will be reduced.The artificial contamination experiment of a 220 kV CVT also indicates that contamination resistance may affect the voltage measurement accuracy in serious contamination area.Therefore
CVT needs regular cleaning to ensure its measurement accuracy.